@mixin text-emphasis {
    overflow: hidden; 
    white-space: nowrap; 
    text-overflow: ellipsis;
}
@mixin flex-content ($justify-content: space-between) {
    display: flex; 
    justify-content: $justify-content; 
    align-items: center; 
}
// flex 对齐方式
@mixin flex-align {
    display: flex;
    align-items: center;
}

